Porting Qt4 to Qt5

Question

I am trying to port my Qt4 Vs2005 project to Qt5 Vs2012. After editing include paths and changing linker dependencies from QtCored4.lib;QtGuid4.lib;QtNetworkd4.lib; to Qt5Cored.lib;Qt5Guid.lib;Qt5Networkd.lib; i still get hundreds of linking errors:

1>main.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""__declspec(dllimport) public: void __thiscall QWidget::showMaximized(void)" (__imp_?showMaximized@QWidget@@QAEXXZ)" in Funktion "_main". 1>main.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""__declspec(dllimport) public: __thiscall QApplication::QApplication(int &,char * *,int)" (__imp_??0QApplication@@QAE@AAHPAPADH@Z)" in Funktion "_main". 1>main.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""__declspec(dllimport) public: virtual __thiscall QApplication::~QApplication(void)" (__imp_??1QApplication@@UAE@XZ)" in Funktion "_main". 1>main.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""__declspec(dllimport) public: static int __cdecl QApplication::exec(void)" (__imp_?exec@QApplication@@SAHXZ)" in Funktion "_main". 1>object.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""__declspec(dllimport) public: __thiscall QWidget::QWidget(class QWidget *,class QFlags)" (__imp_??0QWidget@@QAE@PAV0@V?$QFlags@W4WindowType@Qt@@@@@Z)" in Funktion ""public: __thiscall Object::Object(class QWidget *)" (??0Object@@QAE@PAVQWidget@@@Z)". 1>ppi.obj : error LNK2001: Nicht aufgelöstes externes Symbol ""__declspec(dllimport) public: __thiscall QWidget::QWidget(class QWidget *,class QFlags)" (__imp_??0QWidget@@QAE@PAV0@V?$QFlags@W4WindowType@Qt@@@@@Z)".

Here it is told to run qmake from project window, but i cannot find any button for qmake?

StackOverflow

Thank you!

Thank you this solves the problem! The only problem now is, that qt prints a questionmark into a black square instead of printing the degree sign °, but i think i will fix that later. Is there an easier way to port Qt-projects or is this the right way how i did it? — honiahaka10

Vladimir Bershov Vladimir Bershov · Accepted Answer · 2016-01-24T13:57:11

Migrating from Qt4 to Qt5 in Visual Studio

Simply open your project in the new ver. of Visual Studio with integrated to it Qt5
Open menu Qt5 -> Qt Project Settings:
In the Properties tab, select the required version of Qt5:
Switch to the Qt Modules tab and check the required modules. Usually, you should select Core, Gui and Widgets, and may be some others (depending of your project):
Press Ok, and then go to the menu Project -> your_proj_name Properties:
Go to the Configuration Properties -> Linker -> Input -> Additional Dependecies, and then remove old dependecies from Qt4 libs. (Do not forget to do it for all of your Configurations (Debug, Release, etc.)

Porting Qt4 to Qt5

1 Answers